synchronized和java.util.concurrent.locks.Lock的比较，描述正确的是（）    

A . HOLD_OVER_MODE B . FREE_RUNNING_MODE C . LOCKED_MODE D . STARTUP_MODE

A . Hub B . Breaker C . Switch D . Wire

A . eliminate slippage B . provide excitation C . provide starting torque D . increase efficiency

A . an exciter driven by the same shaft with the generator B . an exciter driven by external prime mover C . generator itself D . either A and B

A . improve power factor B . reduce voltage oscillation C . increase the insulation of circuits D . eliminate regenerated magnetic field

A .  IGMP is not synchronized between vPC peers B .  Cisco Fabric Service carries IGMP entries across the vPC peer link C .  IP ARP synchronization under the vPC domain configuration also synchronizes IGMP D .  IGMP is flooded to the L2 domain， and there is no need to synchronize it between vPC peer

A .  Synchronizes ARP entries between vPC peers every five minutes B .  Triggers a manual update of ARP entries from the primary peer to the secondary C .  Enables a bulk loading of ARP entries when a vPC peer is restored D .  Uses the peer-keepalive link to maintain ARP table consistency

A . 类 B . 变量 C . 方法 D . 接口

A . Routing information received through an IBGP session is not forwarded to another IBGP neighbor， onlyto EBGP neighbors B . Routing information received through an EBGP session is not forwarded to another EBGP neighbor，only to IBGP neighbors C . BGP neighbor peerings are established and sychronized using the TCP 3-way handshake D . BGP shall not advertise a route until that route has been learned via an IGP also

A . 正确 B . 错误

A . A BGP router can only advertise an EBGP learned route， provided that the route is an IGP route in the routing table. B . A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route in the routing table. C . A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route that is not in the routing table. D . A BGP router can only advertise an EBGP learned route， provided that the route is a metric of 0 in the BGP table.

A . temp files B . online data files C . offline data files D . read only data file

A . data files B . control files C . redo log files D . parameter files E . archive log file

是 否

A.CDMA2000 B.GSM C.TD-SCDMA D.WCDMA E.WiMax F.LTE 此题为多项选择题。

A、非同步 B、桌面应用